Distortional Buckling of I-Beams by Finite Element Method

Authors: Poon C-P.; Ronagh H.R.

Source: Advances in Structural Engineering, Volume 7, Number 1, 1 January 2004 , pp. 71-80(10)

Publisher: Multi-Science Publishing Co Ltd

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Abstract:

Distortional buckling, unlike the usual lateral-torsional buckling in which the cross-section remains rigid in its own plane, involves distortion of web in the cross-section. This type of buckling typically occurs in beams with slender web and stocky flanges. Most of the published studies assume the web to deform with a cubic shape function. As this assumption may limit the accuracy of the results, a fifth order polynomial is chosen here for the web displacements. The general line-type finite element model used here has two nodes and a maximum of twelve degrees of freedom per node. The model not only can predict the correct coupled mode but also is capable of handling the local buckling of the web.

Keywords: DISTORTIONAL BUCKLING; FINITE ELEMENT; I-BEAMS; LOCAL BUCKLING; STRUCTURAL STABILITY.

Document Type: Research article

DOI: 10.1260/136943304322985774

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